First-ever end-to-end optical traffic grooming with CRS-3

One of the exciting new features of the recently launched CRS-3 router enables Service Providers to implement first-ever all-optical end-to-end traffic grooming. One of the new linecards (unfortunately not compatible with CRS-1 due to increased hardware complexity) supports the SFSS protocol (defined in RFC 4824).

Using a high-quality video link and all-optical spatial separators you can easily transport more than one SFSS instance on the same wavelength, allowing you to implement a true sub-lambda traffic grooming in the optical domain. There’s just one gotcha: due to the encoding requirements of SFSS, you cannot carry it in the dense channel spacing of DWDM; you have to use CWDM or even wider optical bands depending on the receiver’s capabilities.


  1. Thats seems to be good :)
  2. Is the traffic grooming backward-compatible with RFC2549? Hopefully it can at least help monitor those older links.
  3. Oh my, that’s a tough one. While traffic grooming is definitely implementable on RFC 2549-based networks, those networks use a completely different physical domain and the transponders performing avian-to-optical conversion are not available yet.
  4. I've been hearing of great strides in that optical transponder technology lately, with quad-porro prisms, Advanced Fusion Hybrid quantum transmission, PC-3 phase coating.. and don't forget XTR.

    (note: I do not work for, nor do I endorse any products from, the company referenced by the URL)

    They seem ideal for monitoring RFC2549 carrier and non-carrier frames alike. Grooming really isn't too much of a concern, since those frames sort of groom themselves ;)
Add comment